Moving a plunger tube forward (In relation to where it sits stock) can increase the volume of air that would be in front of the plunger head while the gun is cocked. The plunger rod/head is then allowed more of a draw, and thus more power. It can be done on a NF, though it rarely is. I can snag some pictures of mine if you'd really like to see it.
I'm not quite sure of how moving the PT forward would change anything, perhaps an example could help. I thought about a plunger swap, but i don't have any bigger on hand and as stated, this was a quick an easy to do mod. I don't wan't to get too much work on a gun that will most probably break down after 500 shots if you know what I mean...
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